Get some ink
Get some white fabric
Get some flat lighting
Set up your camera to shoot straight down -- build a copy stand, in other words
Sprinkle some ink on the stand's surface
Roll the camera, and drop the fabric on the ink
Repeat until you have a good stable of high-contrast shots
If you want to get tricky, you can also influence the path the ink takes by rubbing a little candle wax into the fabric in the pattern of your choice.